Rotary Drawer Case Fastening for Tool-Free Secure Assembly
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Solution Overview
Problem
Conventional electronic device cases require screws for assembly and disassembly, which are inconvenient, especially for frequent use, and can lead to screw loss or damage to thread holes and screw slots.
Innovation Solution
A screw-less design using a rotary part with protrusion portions and hinge mechanisms that allow for assembly and disassembly without tools, where the rotary part turns to secure the drawer device within the case, eliminating the need for screws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screws are used to fasten the drawer device to the case, then the drawer device can be securely fixed, but the assembly and disassembly process becomes inconvenient and requires hand tools
Solution Approach 1:
The patent removes the screw fastening system from the assembly process. The rotary part with protrusion portions directly engages with corresponding holes in the drawer device and case, eliminating the need for screws entirely. This extraction of the screw component resolves the contradiction by providing both secure fixing and tool-free assembly/disassembly.
Solution Approach 2:
Instead of using screws that require insertion and tightening with tools, the patent employs a rotary mechanism where the protrusion portions rotate into engagement with the holes. The assembly is secured by the rotational motion itself rather than by threading screws, inverting the traditional fastening approach to achieve both reliability and ease of operation.
2Reliability
If screws are used for fastening, then the drawer device can be firmly attached, but repeated assembly and disassembly can cause screws to be lost or damaged
Solution Approach 1:
The patent eliminates screws from the fastening system entirely, replacing them with a rotary part that has protrusion portions which directly engage with holes in the drawer device and case. This removal of the screw component prevents screw loss and damage while maintaining firm attachment through the rotary engagement mechanism.
Solution Approach 2:
The patent combines the fastening function and the positioning function into a single rotary mechanism. The protrusion portions serve both to locate the drawer device correctly and to secure it firmly, eliminating the need for separate screw components that could be lost or damaged during repeated assembly and disassembly operations.
3Reliability
If conventional screw fasteners are used, then the drawer device can be securely mounted, but the thread holes and screw slots may be damaged after multiple assemblies
Solution Approach 1:
The patent removes the screw fastening system that causes thread hole damage. The rotary part with protrusion portions engages directly with holes in a manner that does not involve threading or repeated insertion/removal of screws, thereby preventing damage to the holes while maintaining secure mounting.
Solution Approach 2:
The rotary part with its protrusion portions serves as a reusable fastening mechanism that avoids the wear and damage issues associated with screws. The design allows for multiple assembly and disassembly cycles without degrading the mounting holes, effectively replacing the disposable nature of screws with a durable rotary engagement system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables convenient assembly and disassembly of electronic devices without requiring hand tools, preventing screw loss and damage, and simplifying the process for users.
Implementation Method 1
the rotary part turns in a first rotating direction and further makes the second protrusion portion pass through the second hole and be fixed in the first hole
Implementation Method 2
the first protrusion portion receives a first moment that turns in the first rotating direction, and the first moment is larger than the second moment
Implementation Method 3
Once the third protrusion portion holds the second sidewall by pressure, the rotary part produces a second moment to make the second protrusion portion out of the second hole
Data Source
AI summary
A case including a holding portion and a rotary part is used to fix a drawer device. A first sidewall of the drawer device has a first hole. The holding portion has a second sidewall and the drawer device is disposed in the holding portion. A second hole is located in the second sidewall. The position of the second hole is corresponding to the first hole. The rotary part is pivoted on an outer side of the holding portion through a first hinge portion and the first hinge portion is located between a first protrusion portion and a second protrusion portion. When the drawer device comes into the holding portion, the drawer device is in contact with the first protrusion portion, which makes the rotary part turn in a first rotating direction and the second protrusion portion pass through the second hole to be fixed in the first hole.